These are classic phishing scams, trying to trick you into clicking a link inside the message, which will load malware onto your computer.
Only download Netflix software for their web site or your App Store. Never from an email link. Also never update payment information from an email link. Go directly to the website, login to your account and then make the change. Be sure you are logging in through an SSL encrypted HTTPS URL and if the site offers any form of two factor authentication, enable it!
Don’t fall victim to these scams! Stay Safe Online!